you will find so many issues with this set up and material used. i cant help you with this but i reconstructed the intire unit.
I know its been a few months since you posted this, but I would like to do the same.
What materials do I need and where can I buy it.
For the bearings,shaft,chain and universal collars, go on line at McMaster-Carr. For the gear track and 3 gears sprockets you can order at Nexdome. I used a metal lathe and drill press to make all the other parts. I replaced the backing plate out of aircraft aluminum. Sorry I have no measurements for you.
I also missed the set screw location/existence (there was no bolt in mine either. I did figure it out at some point recently though and that helped reduce the gear slipping. Now it may be binding up both due to the motor occasionally not having strong enough battery (my battery charging is very temperamental), too much set screw , or friction in the housing. It is strange to me where it does it. Pulling the track down near the sprocket or pushing in the direction it needs to go always gets it there though. I should probably film it.
Anyway have you guys fixed yours yet? Any must do's? I see the 80mm wheels. I have done teflon spray and so far I've got my retention kit installed.
I finally got time to take some pictures.
Also, here is the "slidy" take I used to smooth the panel sliding :
Shutter closed, the smaller wheel still block the shutter as expected :
Shutter open :
Front wheel with extra washers shutter closed
Close up of the washer stack using one of the small washer from the Spacers kit :
Slidy tape (I added some in other places but this made the most significant improvement) :
1 : yes I got the black 80mm ones. I wanted some smaller one to make sure they were not going to be pressing hard like the original ones (100mm I thing).
2 : no the original bold were long enough.
Hi Steven, as said in the other post, I'm in the Bay Area, north of Berkeley.
The wheel are indeed the one outisde on the top of the dome.
I changed the back one for these : https://www.amazon.com/gp/product/B072LXGJ2B/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
and added a spacer so it goes : dome + washer + spacer + washer + wheel+washer+screw.
These are the spacers I used : https://www.amazon.com/gp/product/B00PV15PMQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
So I only used 2, with the new wheel , on the back.
On the front wheel I thin I have 4 washers or the wheel press too hard on the shutter and cause more binding.
For me the shutter retention kit was pressing to hard on the shutter in some places when closing (and sometimes when opening).
I plan on putting a tarp on top with these strap to retain the dome when there is a storm in the forecast : https://www.amazon.com/dp/B07YQ58Q9D/?coliid=I18SK3SYPOKG6C&colid=H2JUHQKQJ7I8&psc=1&ref_=lv_ov_lig_dp_it
As I have a square structure I can have these hooks in the bottom corner to attache the strap to :
With the bad air outside due to the large fire in California, I haven't had a change to take close up picture of the smaller wheel and other things.
Hopefully I can get some for you soon.
I'll take some picture tomorrow.
I had countless issue with the shutters.
First, as Steve says, try to get the tension plate to keep the track in contact... but not too much or it'll bind.
I also remove the shutter retention kit, it was pushing to hard on the shutters panel creating additional friction .. and binding.
I also replace the back wheel with smaller one and put a skateboard ball bearing spacer between the dome and the wheel so that when both panel are on top of each other they don't bind.
I also added a fair amount of "teflon" tape along he seams of the dome and between the 2 shutter panels.
It is now a lot better.
But I would say the whole shutter assembly is not very satisfying when that's the only thing protecting the equipment if it starts to rain and has to close.. if binding happens at that moment ... it could be catastrophic.
Roy, when you say binding are you referring to the motor turning but not advancing along the track, skipping in place, or stopping?
There is a tension plate directly behind the motor gear that can be moved via a hex set screw.
Unfortunately to access the set screw the motor assembly has to be removed from the shutter.